龙卷诱发原因的实例分析

利用雷达、自动站等资料，对一次龙卷过程进行了讨论与研究，详细分析了龙卷发生发展过程中系统结构及环境场特征的变化，并对龙卷的诱发原因进行了动力学探讨，结果表明：龙卷发生于气旋性涡度的高度集中区，对流层中层干冷空气的入侵，构成了上冷下暖的对流不稳定结构，当风场中的强风速带移近时，风速带上激发出中气旋系列，对流不稳定的加强，促使中气旋垂直对流强烈发展，从而导致龙卷天气的产生，进一步的动力学分析表明，当存在有较强的风垂直切变时，中尺度涡度方程中的倾斜项是造成中尺度扰动涡度变化的主要贡献者，也是这次龙卷天气产生的重要原因之一。

Analysis on the inducing cause of the tornado

With radar and automatic meteorological observing station data,a tornado course was studied. System structure during the development of tornado and the change of circumstance characters were analyzed in detail,and the inducing causes of the tornado course also were discussed dynamically in this paper. The results indicate that the tornado forms in highly converging area of cyclonic vorticity. Also dry and cold air invading from middle troposphere result in convective instability structure of cold advection ...